diff --git a/13_convolutional_neural_networks.ipynb b/13_convolutional_neural_networks.ipynb
index ac7b53f..b3eec36 100644
--- a/13_convolutional_neural_networks.ipynb
+++ b/13_convolutional_neural_networks.ipynb
@@ -500,6 +500,17 @@
     "    saver = tf.train.Saver()"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {
+    "collapsed": true
+   },
+   "source": [
+    "Note: if you are using Python 3.6 on OSX, you need to run the following command on terminal to install the certifi package of certificates because Python 3.6 on OSX has no certificates to validate SSL connections (see this [StackOverflow question](https://stackoverflow.com/questions/27835619/urllib-and-ssl-certificate-verify-failed-error)):\n",
+    "\n",
+    "    $ /Applications/Python\\ 3.6/Install\\ Certificates.command"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": 22,
@@ -1948,7 +1959,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.5.2"
+   "version": "3.6.2"
   },
   "nav_menu": {},
   "toc": {